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what is the next stop after 30s?

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    ireid7
    ireid7 e2 Member 8ireid7 vcard Scotland
    24 Oct 2010 - 10:55 PM

    can anyone tell me what the next "stop" is after 30 sec? i am trying to work out exposure times with b+w 10 stop filter? cheers

    Last Modified By ireid7 at 24 Oct 2010 - 11:03 PM
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    24 Oct 2010 - 10:55 PM

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    ade_mcfade
    ade_mcfade e2 Member 1014786 forum postsade_mcfade vcard England216 Constructive Critique Points
    24 Oct 2010 - 10:59 PM

    60 seconds

    each stop is twice as long as the previous

    prizes for guessing what the next stop is Wink

    Helpful Post! This post was flagged as helpful
    ireid7
    ireid7 e2 Member 8ireid7 vcard Scotland
    24 Oct 2010 - 11:03 PM

    ok silly question!!

    ade_mcfade
    ade_mcfade e2 Member 1014786 forum postsade_mcfade vcard England216 Constructive Critique Points
    24 Oct 2010 - 11:06 PM

    ah
    well that's about 1000 times the unfiltered exposure

    2 to the power 10 = 1024

    Nick_w
    Nick_w e2 Member 73848 forum postsNick_w vcard England99 Constructive Critique Points
    25 Oct 2010 - 5:38 PM

    If you have a smart phone get the "long exposure" app it works it all out for you.

    But basically Each stop doubles the time of the last exposure, so 60,120,240,480,960 etc (Your maths is wrong Ade!)

    A 30 second exposure without filter would be 8 hours 32 minutes with !!!

    0.3seconds gives a 30 second exposure.

    ade_mcfade
    ade_mcfade e2 Member 1014786 forum postsade_mcfade vcard England216 Constructive Critique Points
    25 Oct 2010 - 6:05 PM

    Wrong maths???

    10 stops as follows Nick - each step being the factor you multiply by to get the new exposure

    2
    4
    8
    16
    32
    64
    128
    256
    512
    1024



    so 0.3 seconds is approx 1000*0.3 = 300 seconds
    30 seconds is approx 1000*30 = 30000 seconds

    When you've worked out you're maths is incorrect Nick, let me know Wink

    Nick_w
    Nick_w e2 Member 73848 forum postsNick_w vcard England99 Constructive Critique Points
    25 Oct 2010 - 6:27 PM

    But the original poster wanted it from 30 secs Ade not 1 second. In your first reply you said 1024 seconds Tongue
    30=base level
    60 =1 stop
    120
    240
    480
    960
    1920
    3840
    7680
    15360
    30720 =10 stop = 8hours 32 mins

    Last Modified By Nick_w at 25 Oct 2010 - 6:35 PM
    ade_mcfade
    ade_mcfade e2 Member 1014786 forum postsade_mcfade vcard England216 Constructive Critique Points
    25 Oct 2010 - 11:27 PM


    Quote: In your first reply you said 1024 seconds

    where?

    I seem to recall saying this...


    Quote: ah
    well that's about 1000 times the unfiltered exposure

    2 to the power 10 = 1024

    no mention of seconds..... Tongue

    Tooth
    Tooth  95772 forum posts Ireland227 Constructive Critique Points
    26 Oct 2010 - 11:54 PM

    Seconds out, round 2....

    digicammad
    digicammad  1121988 forum posts United Kingdom37 Constructive Critique Points
    27 Oct 2010 - 7:00 AM

    errrrm

    Actually the only difference is that Ade said 'about 1000 times'. The difference between your answers is only down to multiplying the difference between 1000 and 1024.

    Whether a 2.4% difference in exposure is noticeable is something I will leave to those with a 10 stop filter. Smile

    Ian

    Geoffphoto
    27 Oct 2010 - 4:49 PM

    It's still a bloody long time !!

    Make sure that you've got a good tripod !!!!!! Smile

    ade_mcfade
    ade_mcfade e2 Member 1014786 forum postsade_mcfade vcard England216 Constructive Critique Points
    27 Oct 2010 - 6:51 PM

    lol

    it's not my maths, but Nick's reading that's at fault Wink

    Nick_w
    Nick_w e2 Member 73848 forum postsNick_w vcard England99 Constructive Critique Points
    27 Oct 2010 - 7:13 PM

    Can't believe this is still going.

    Think we will call it a drawWink

    on a semi serious note it's when you understand "stops" you can start thinking on your feet, be it shutter speed , aperture or the one people tend to forget about ISO.

    Get the calculator ready Ade for round twoWink

    ian in the litreture it says the 10 stopper from Lee says it can vary between 9 and 11 stops which in time terms can be quite a bit. But +\- 1 stop is easily controlled in RAW.

    Last Modified By Nick_w at 27 Oct 2010 - 7:24 PM
    ianfox
    ianfox  4 United Kingdom
    9 Nov 2010 - 12:48 AM

    I've never used a digital camera for an exposure longer than a second.

    Back in the last century when I used to use film, you used to get reciprocity failure with long exposures. I take it this doesn't happen in the digital age?

    User_Removed
    9 Nov 2010 - 12:56 AM

    No reciprocity issue but you do have random noise and photodiode leakage with most sensors. - Rendering anything over a certain length a noisy mess.

    This is why people "in the know" will burst multiple digital images for long exposures and not use bulb. (Since the images can later be stacked by value in software)

    And if anyone disagrees go use your digital camera on a 4 hour bulb then 240 stacked 1 min exposures.

    Obviously you will then have to take into account if your subject is a point source or not, and change format accordingly.

    Last Modified By User_Removed at 9 Nov 2010 - 12:57 AM
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